1278576383920 has 80 divisors (see below), whose sum is σ = 3243164781312. Its totient is φ = 464903873280.

The previous prime is 1278576383873. The next prime is 1278576383939. The reversal of 1278576383920 is 293836758721.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14778709 + ... + 14864971.

Almost surely, 2^{1278576383920} is an apocalyptic number.

1278576383920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278576383920 is an abundant number, since it is smaller than the sum of its proper divisors (1964588397392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278576383920 is a wasteful number, since it uses less digits than its factorization.

1278576383920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103130 (or 103124 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 61.

The spelling of 1278576383920 in words is "one trillion, two hundred seventy-eight billion, five hundred seventy-six million, three hundred eighty-three thousand, nine hundred twenty".